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To me, easily the most compelling feature is multiple environment management.

I am constantly bitten by this, say, whenever I want to run multiple Ruby/Rails apps on the same machine.

Experiencing "can't activate foo (= 2.0, runtime), already activated foo-1.0" errors is a terrible way to start the work week.

I'd like to hear more about how it resolves dependency conflicts more conveniently than Rubygems though.

I got back from Railsconf and couldn't start the GitHub Rails app because of some dependency issues caused by a random gem I had installed at the conference.

I feel your pain. That's where it all began.

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